Wireless telegraphy.



No. 685.742. Patnted Nov. 5, IBM.

A.F. COLLINS.

WIRELESS TELEGRAPHY.

(Applicltion filed Mar. 81, 1900.)

(No Mddal.)

' WITNESSES: INVENTOR d daiakm; W 4 1d UNITED STATES PATENT OFFICE.

ARCHIE FREDERICK COLLINS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CHARLES A. CHASE, OF PHILADELPHIA, PENNSYLVANIA.

WIRELESS TELEGRAPHY.

SPECIFICATION forming part of Letters Patent N 0. 685,742, dated November 5, 1901.

' Application filed March 31,1900. Serial No. 10 ,888. (in) model.)

To whom it y 007M167! creased at 9 and 10, as the condenser 14 is be Be it known that I, ARCHIE FREDERICK ing charged or not, respectively. This Va- COLLINS, a citizen of the United States, residriation of the induced current aifects the bating at Philadelphia, in the county of Philatery-current in the primary coil, which re- 55 5 delphia and State of Pennsylvania, have insults in immediately varying the vibration of vented new and usefulImprovementsin Wirethe automatic interrupter, which in turn less Telegraphy, of which the following is a again correspondingly varies theinduced curspecification. rent of the secondary coil that is delivered to My invention relates to improvements in the ground-glate 12-=that is, assuming that 60 wireless telegraphy and the like. the interrupter is set to agiven rate of vibra- My object is to provide improved means for tions when the induction coil is connected causing definite electric oscillations to travel with the ground-plate only, then upon closing by the earths conduction from a transmitter key 11 to connect the condenser 14 with the to a suitable responsive receiver and means secondary coil the rate of vibration of the au- 65 for arbitrarily and at will varying said transtomatic vibrator is thereby affected, which mitted oscillations in signaling. in turn modifies or varies the induced current Referring to the drawings, Figure 1 is a diadelivered to ground 12. grammatic view of my transmitting and re- The current delivered to ground 12 radiates ceiving means. Fig. 2 is a diagrammatic detherefrom through the earth, and the portion 7c tail of a Ruhmkorff coil and its connections. which comes into contact with ground 16 is Similar numerals refer to similar parts conveyed through the receiver 15 to the conthroughout both views. denser 17, the receiver indicating the dots My Ruhmkorff coil 1. is composed and bonand dashes by the frequency and duration, nected as follows: The primary coil 2 is wound respectively, of the two tones as the key 11 is 75 upon a soft core 3 and connected in circuit closed or open.

with the battery 4 and the condenser 5. The What I claim is. automatic vibrating armature or interrupter 1. In combination with a source of electric 6 and the adjusting-screw 7are connected for current, a ground and a condenser, a Ruhmregulating the vibrating rate, normally in cirkorff coil, the primary of which is connected 80 o cuit between the coil 2 and battery 4. The with the source of electric current, the secondvibrator 6 is kept in motion by the current ary connected between the groundand aconfrom the battery 4, producing a tone of nordenser, and means for arbitrarily breaking mally uniform pitch, except when varied by and making connection between the secondthe Morse key 11, as will be hereinafter deary and the condenser, the said mechanism '85 scribed. The secondary coil 8, which surconstituting a transmitter; and a receiver rounds the primary coil 2, is electrically conconsisting of a second ground, at a distance nected by binding-post 9 at one terminal with from the first, having electrically responsive the ground-plate 12 and by the binding-post means connected therewith, whereby the in- 10 atits opposite terminal, through the Morse dications of said transmitter may be manio 0 key 11, with the condenser 14. g The receiver fested by said receiver, substantially as de- 15, provided with electrically responsive scribed. means, is connected between the ground- 2. The combination of a source of electric plate 16 and the condenser 17. energy, a primary coil and condenser con- The ground-plates 12 and 16 are preferably nected therewith, an automatic electric inter- 5 4.5 of copper sunk deeply enough in the earth to rupter operated by the current in said priinsure a moist contact, mary coil, means of adjustment for same, a When the key 11 is closed by the hand or secondary coil having one terminal connected otherwise, thus connecting 10 with 14, a porwith a ground and the other terminal with a tion of the induced current flows'into the consecond condenser and means for arbitrarily I00 denser 14, and the electromotive force of the at will making and breaking connection beinduced current is thereby diminished or intween said secondary coil and said second minal with a second condenser, and means for arbitrarily, at Will, making and breaking connection between said coil and said second condenser, and a distant ground provided with a condenser in electrical connection therewith and an electrical receiver on said circuit, substantially as described.

ARCHIE FREDERICK COLLINS.

Witnesses:

JOHN THIEL, MAE HOFFMANN. 

